<template>
  <div class="app-container">
    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <!-- 所属分类：级联下拉列表 -->
      <!-- 一级分类 -->
      <el-form-item label="课程类别">
        <el-select
          v-model="searchObj.subjectParentId"
          placeholder="请选择"
          @change="subjectLevelOneChanged">
          <el-option
            v-for="subject in oneLevelSubjectList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>
        <!-- 二级分类 -->
        <el-select v-model="searchObj.subjectId" placeholder="请选择">
          <el-option
            v-for="subject in twoLevelSubjectList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"/>
        </el-select>
      </el-form-item>
      <!-- 标题 -->
      <el-form-item>
        <el-input v-model="searchObj.title" placeholder="课程标题"/>
      </el-form-item>
      <!-- 讲师 -->
      <el-form-item>
        <el-select
          v-model="searchObj.teacherId"
          placeholder="请选择讲师">
          <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"/>
        </el-select>
      </el-form-item>
      <el-button type="primary" icon="el-icon-search" @click="fetchData()">查询</el-button>
      <el-button type="default" @click="resetData()">清空</el-button>
    </el-form>
    <!-- 表格 -->
    <el-table
      v-loading="listLoading"
      :data="list"
      element-loading-text="数据加载中"
      border
      fit
      highlight-current-row
      row-class-name="myClassList">
      <el-table-column
        label="序号"
        width="70"
        align="center">
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>
      <el-table-column label="课程信息" width="470" align="center">
        <template slot-scope="scope">
          <div class="info">
            <div class="pic">
              <img :src="scope.row.cover" alt="暂无封面" width="150px">
            </div>
            <div class="title">
              <a href="#">{{ scope.row.title }}</a>
              <p>{{ scope.row.lessonNum }}课时</p>
            </div>
          </div>
        </template>
      </el-table-column>
      <el-table-column label="课程讲师" align="center">
        <template slot-scope="scope">
          <template v-for="teacher in teacherList">
            <div v-if="scope.row.teacherId == teacher.id">{{teacher.name}}</div>
          </template>
        </template>
      </el-table-column>
      <el-table-column label="课程类别" align="center" width="150px">
        <template slot-scope="scope">
          <template v-for="oneSubject in oneLevelSubjectList">
            <template v-for="twoSubject in oneSubject.children">
              <div v-if="scope.row.subjectId === twoSubject.id">
                {{scope.row.subjectParentId?oneSubject.title+'/':''}}{{twoSubject.title}}
              </div>
            </template>
          </template>

        </template>
      </el-table-column>
      <el-table-column label="创建时间" align="center">
        <template slot-scope="scope">
          {{ scope.row.gmtCreate.substr(0, 10) }}
        </template>
      </el-table-column>
      <el-table-column label="发布时间" align="center">
        <template slot-scope="scope">
          {{ scope.row.gmtModified.substr(0, 10) }}
        </template>
      </el-table-column>
      <el-table-column label="价格" width="100" align="center">
        <template slot-scope="scope">
          {{ Number(scope.row.price) === 0 ? '免费' :

          '¥' + scope.row.price.toFixed(2) }}
        </template>
      </el-table-column>
      <el-table-column prop="buyCount" label="付费学员" width="100" align="center">
        <template slot-scope="scope">
          {{ scope.row.buyCount }}人
        </template>
      </el-table-column>
      <el-table-column prop="viewCount" label="浏览人数" width="100" align="center">
        <template slot-scope="scope">
          {{ scope.row.viewCount }}人
        </template>
      </el-table-column>
      <el-table-column prop="status" label="状态" width="100" align="center">
        <template slot-scope="scope">
          {{ scope.row.status === 'Draft'? '未发布':'已发布' }}
        </template>
      </el-table-column>
      <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
          <router-link :to="'/edu/course/info/'+scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit">编辑课程信息</el-button>
          </router-link>
          <router-link :to="'/edu/course/chapter/'+scope.row.id">
            <el-button type="text" size="mini" icon="el-icon-edit">编辑课程大纲</el-button>
          </router-link>
          <el-button type="text" size="mini" icon="el-icon-delete" @click="deleteCourse(scope.row.id)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    <!-- 分页 -->
    <el-pagination
      @size-change="handleSizeChange"
      :current-page="page"
      :page-sizes="[5, 10, 15, 20]"
      :page-size="limit"
      :total="total"
      style="padding: 30px 0; text-align: center;"
      layout="total,sizes, prev, pager, next, jumper"
      @current-change="fetchData"
    />
  </div>
</template>

<script>

    import course from '@/api/course'
    import teacher from '@/api/teacher'
    import subject from '@/api/subject'

    const defaultSearchObj = {
        subjectParentId: '',
        subjectId: '',
        title: '',
        teacherId: ''
    }
    export default {
        name: "index",
        data() {
            return {
                listLoading: true, // 是否显示loading信息
                list: null,//数据
                total: 0,//总页数
                page: 1,//页码
                limit: 5,//每页的记录数
                searchObj: {
                    subjectParentId: '',
                    subjectId: '',
                    title: '',
                    teacherId: ''
                },  //查询条件
                teacherList: [], // 讲师列表
                oneLevelSubjectList: [],//一级分类列表
                twoLevelSubjectList: [] //二级分类列表
            }
        },
        created() {
            this.searchObj = {
                subjectParentId: '',
                subjectId: '',
                title: '',
                teacherId: ''
            }
            //获取课程数据
            this.fetchData()
            //初始化讲师列表
            this.initTeacherList()
            //初始化分类列表
            this.initSubjectList()
        },
        methods: {
            /*初始化课程列表*/
            fetchData(page = 1) {
                this.page = page
                this.listLoading = true
                course.getPageList(this.page, this.limit, this.searchObj)
                    .then(response => {
                        if (response.data.success) {
                            this.list = response.data.data.items
                            this.total = response.data.data.total
                        }
                        this.listLoading = false
                        console.log(this.list)
                    })
                    .catch(response => {

                    })
            },
            /*初始化教师列表*/
            initTeacherList() {
                teacher.getTeacherList()
                    .then(response => {
                        this.teacherList = response.data.data.items
                    })
            },
            /*每页的记录数改变*/
            handleSizeChange(val) {
                this.limit = val
                this.fetchData()
            },
            /*清空*/
            resetData() {
                this.searchObj = {
                    subjectParentId: '',
                    subjectId: '',
                    title: '',
                    teacherId: ''
                }
                console.log(this.searchObj)
                this.fetchData()
            },
            /*初始化分类列表*/
            initSubjectList() {
                subject.getAllSubjectList()
                    .then(response => {
                        this.oneLevelSubjectList = response.data.data.items
                    })
            },
            /*初始化分类二级列表*/
            subjectLevelOneChanged(value) {
                for (let i = 0; i < this.oneLevelSubjectList.length; i++) {
                    if (this.oneLevelSubjectList[i].id === value) {
                        this.twoLevelSubjectList = this.oneLevelSubjectList[i].children
                    }
                }
            },

            /*根据ID删除课程*/
            deleteCourse(id) {
                this.$confirm('此操作将永久删除该课程，以及该课程下的章节和视频，是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).then(() => {
                    return course.deleteCourseById(id)
                }).then((response) => {
                    if (response.data.success) {
                        this.fetchData()
                        this.$message({
                            type: 'success',
                            message: `${response.data.message}`
                        })
                    }
                }).catch((response) => {
                    // 失败
                    if (response === 'cancel') {
                        this.$message({
                            type: 'info',
                            message: '已取消删除'
                        })
                    }
                })
            }
        }
    }
</script>

<style scoped>
  .myClassList .info {
    width: 450px;
    overflow: hidden;
  }

  .myClassList .info .pic {
    width: 150px;
    height: 90px;
    overflow: hidden;
    float: left;
  }

  .myClassList .info .pic a {
    display: block;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
  }

  .myClassList .info .pic img {
    display: block;
    width: 100%;
  }

  .myClassList td .info .title {
    width: 280px;
    float: right;
    height: 90px;
  }

  .myClassList td .info .title a {
    display: block;
    height: 48px;
    line-height: 24px;
    overflow: hidden;
    color: #00baf2;
    margin-bottom: 12px;
  }

  .myClassList td .info .title p {
    line-height: 20px;
    margin-top: 5px;
    color: #818181;
  }
</style>
